公开(公告)号：US4355334A

公开(公告)日：1982-10-19

申请号：US268441

申请日：1981-05-29

Applicant: James J. Fitzgibbon ,  Leroy Sutton

Inventor： James J. Fitzgibbon ,  Leroy Sutton

IPC: H04N5/58 ,  H04N5/20

CPC classification number: H04N5/58

Abstract: A dimmer and dimmer override control is described for adjusting the amplitude of a video signal applied to a video display device. The control includes an amplifier for amplifying a video input signal, a light sensor for generating a dimmer control signal corresponding to the intensity of ambient light, and a transistor clipping circuit which clips the video signal at levels which vary as a function of the amplitude of the dimmer control signal. The clipping action is defeated by another transistor circuit which responds to a dimmer override signal for disabling the transistor clipping circuit.

Abstract translation: 描述了用于调整施加到视频显示设备的视频信号的幅度的调光器和调光器超控控制。 该控制包括用于放大视频输入信号的放大器，用于产生对应于环境光强度的调光控制信号的光传感器，以及晶体管限幅电路，其以视频信号的幅度 调光控制信号。 限幅动作被另一个晶体管电路击败，该晶体管电路响应用于禁止晶体管限幅电路的调光器超控信号。